This month’s installation on the 18th Street billboard is a perfect example of how a piece of public art can enliven and complement its environs. Jonas Wood’s “Shelf Still Life” has joined us in the midst of a bracing cold snap, and into this historic, arctic air sets before us a lovely view of plants in full bloom. It almost makes you want to unzip your jacket. These are house plants, so the work portrays an indoor scene, but as you walk by it the dead stalks of Compass plants and Prairie dock rise up to remind you that you’re in a real garden. The High Line is a place that’s filled with juxtapositions, and this work fits right in. It’s a playful seduction: colorful, blooming plants almost within reach, in the midst of a Polar Vortex.